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The extended warranty was only an additional year added on to the original from date of purchase. Since that is the case your extended warranty expired 2/28/2010. The panel is part number 289P101010 and is around $1700. Call Mitsubishi and see if they will cover your panel..

I
know this isn't what you want to hear, but the problem you've
described can't be fixed with troubleshooting.
Your TV
will have to be repaired. There is a part that has developed a defect
and needs to be replaced. If you're still in warranty, the TV will be
repaired at no charge to you. The warranty would likely be at least
one year from the date of purchase from the manufacturer. If you
purchased an extended service
plan
they will repair the TV at no charge as well.

If the TV is no
longer in warranty, it will likely cost a minimum of $150 parts and
labor. This is assuming that you only need one circuit
board
or small part. If the problem is more than one of the circuit boards,
the price of repair could go much higher.

I hope I've provided
you useful assistance and that this information allows you to make an
informed decision as to how to proceed from here. Please be sure to
vote on my response. I hope I've earned a good rating from you
today.

Please post a comment if you need further assistance so
that I can help you further.

If your tv is within the one year warranty period then call 1-800-Samsung for warranty repair. Look at your tv purchase receipt for the Purchase Date. You have one year from the date of purchase to get warranty repair.

The problem can be caused by either a Bad Main bd or a Bad Power Supply bd. Those two boards are the common failures. Other boards that can cause this are the T-Con bd and the Inverter bds.. To determine if your tv is in or out of warranty you need to look at your tv Purchase Receipt and see what the Purchase date is. Samsung gives you a One Year parts and labor warranty from the date of purchase on your set. You can also call 1-800-Samsung for more assistance.

Your warranty should very well be honored and yes, the warranty does start right when you leave the store as long as you have the original receipt, otherwise, they might just honor the production date via serial number. If you have the original receipt, then you need to tell them this and speak to someone higher up, like a manager. It is not your fault Circuit City went out of business.

I can just imagine how you feel. Sorry. Our TV, same make and model, just did the same thing today 9/19. Luckily we purchased an extended warranty but however are waiting two weeks for them to show up and who knows what is wrong and how long it will take to fix it?